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The H/K 6x9s are 2 ohms, if memory serves, which is what the BMW H/K amp is expecting to see. Your typical aftermarket car speakers are 4 ohms impedance.

If you hook up a 4 ohm speaker to your H/K amp, with the doubled impedance, your speaker will only see about 12-15 watts of clean (less than 5% THD) power from the amp, so it really doesn't matter what you pop back there- they will be running at well below their power capacity.

As for audio quality, these are rear fill speakers, and the amp has a built-in cross-over which will send the woofers ONLY mid/ low frequencies. You need therefore be concerned with only three things; efficiency (how loud they go for a given amount of input), size (you need a 6x9), and cost (as little as possible).

The Type Rs will be just fine. As I mentioned, if you're running them off of the stock H/K amp, anything will do. As for sound quality, they will sound better than your stock H/Ks, though they will probably be a bit quieter (due to their higher impedance). If the price is right, go for it- they'll provide nice fill to bridge the gap between your fronts and sub.

IF you run a 6x9 that's more efficient then the factory, even though it has a higher impedance, should not notice much of a difference. Why don't you get yourself into a 4 channel amp and give the whole system a boost ?!!?!?